[Letux-kernel] Applied "regulator: core: Fix error return for /sys access" to the regulator tree

Mark Brown broonie at kernel.org
Wed Sep 11 16:59:46 CEST 2019

The patch

   regulator: core: Fix error return for /sys access

has been applied to the regulator tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-5.4

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

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>From c82f27df07573ec7b124efe176d2ac6c038787a5 Mon Sep 17 00:00:00 2001
From: "H. Nikolaus Schaller" <hns at goldelico.com>
Date: Tue, 10 Sep 2019 21:22:29 +0200
Subject: [PATCH] regulator: core: Fix error return for /sys access
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

regulator_uV_show() is missing error handling if regulator_get_voltage_rdev()
returns negative values. Instead it prints the errno as a string, e.g. -EINVAL
as "-22" which could be interpreted as -22 µV.

We also do not need to hold the lock while converting the integer to a string.

Reported-by: Adam Ford <aford173 at gmail.com>
Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
Tested-by: Adam Ford <aford173 at gmail.com>
Link: https://lore.kernel.org/r/f37f2a1276efcb34cf3b7f1a25481175be048806.1568143348.git.hns@goldelico.com
Signed-off-by: Mark Brown <broonie at kernel.org>
 drivers/regulator/core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 340db986b67f..afe94470b67f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -568,13 +568,15 @@ static ssize_t regulator_uV_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 	struct regulator_dev *rdev = dev_get_drvdata(dev);
-	ssize_t ret;
+	int uV;
-	ret = sprintf(buf, "%d\n", regulator_get_voltage_rdev(rdev));
+	uV = regulator_get_voltage_rdev(rdev);
-	return ret;
+	if (uV < 0)
+		return uV;
+	return sprintf(buf, "%d\n", uV);
 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);

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